realNameHidden articles - 161 total
how to use RestTemplate in a Spring Boot application to make an HTTP GET request
✅ What is RestTemplate? RestTemplate is a synchronous client to perform HTTP requests in a Spring...
How to read Query Param in Spring Boot
Create Project with Spring Web Dependency Directory Structure: pom.xml <?xml version="1.0"...
@Qualifier Example in Spring Boot
In Spring, when you have multiple beans of the same type, Spring gets confused about which one to...
@ControllerAdvice and @ExceptionHandler Annotations Spring Boot
Exception Handling in Spring Boot — A Simple Example 🚀 Spring Boot provides multiple ways to handle...
@Bean annotation example in spring boot
Directory Structure pom.xml <?xml version="1.0" encoding="UTF-8"?> <project...
Example of @Async in Spring Boot for Beginners
The @async annotation in Spring Boot allows you to run tasks asynchronously (in the background)...
any() method in Mockito Spring Boot example
The any() method in Mockito is used as a matcher to specify that any value of a given type can be...
doNothing()method example Spring Boot
When to Use doNothing()? When testing void methods that perform side effects (e.g., sending emails,...
doReturn() method in Mockito example
Spring Boot Example Using doReturn() in Mockito The doReturn() method in Mockito is used when you...
thenThrow() method in Mockito example
Scenario: Mocking a Service to Throw an Exception for Testing Error Handling in a Controller 1....
thenReturn() method in Mockito example
Scenario: Mocking a Service to Test a Controller Application Code Employee.java package...
when() method in Mockito example
Spring Boot example demonstrating the use of when() in unit testing with Mockito. The example covers...
verify() method in Mockito example
The verify() method in Mockito is used to confirm that specific interactions with mocked objects...
List.of() vs Arrays.asList() in java
When working with Java, both List.of() (introduced in Java 9) and Arrays.asList() (available since...
@PreConstruct and @PostConstruct annotation Spring Boot Example
@PostConstruct: This method is called after the Spring bean (in this case, ExampleBean) has been...
With Spring can I make an optional path variable?
Yes, you can make a path variable optional in Spring by using @PathVariable with the required...
Java Stream Scenario Based Interview Question
You have a list of employees with fields like name, age, and department. Write a code snippet to...
Java scenario based interview questions
You have a list of strings: ["apple", "banana", "cherry", "date", "fig", "grape"]. Write a code...
How does Optional.ifPresent() differ from Optional.orElse()?
Optional.ifPresent() and Optional.orElse() are two methods in Java's Optional class, designed to...
How does the limit() method differ from the skip() method in streams?
The limit() and skip() methods in Java Streams are used to control the number of elements in a...
Java Streams | What is the difference between sorted() and distinct() in streams?
For Explanation watch video sorted() The sorted() method is used to sort the elements of a...
How does reduce() differ from collect() in Java streams?
The reduce() and collect() methods in Java Streams serve different purposes and operate at different...
Java’s TreeMap.tailMap() Method Explained
For Explanation watch Understanding TreeMap.tailMap() in Detail The TreeMap.tailMap() method in...
Java Stream.distinct()
The Stream.distinct() method in Java is used to filter out duplicate elements from a stream, ensuring...
What is the difference between forEach and map in streams?
forEach: A terminal operation that performs an action on each element of the stream but does not...
Java 8 Stream API limit() and skip() methods
In Java 8, the Stream API provides limit() and skip() methods for controlling the number of elements...
Write a Java program to find duplicate elements in an array
for explanation watch video Find Duplicates using HashSet import java.util.HashSet; public...
Should try-catch be written inside or outside the for loop? And state your reasons.
Whether to write a try-catch block inside or outside a for loop depends on the use case and the...
how to call put method using RestTemplate Spring Boot
For Explanation watch video Producer App Employee package com.example.demo.entity; import...
Find the Duplicate Elements in an Array/List
Given an array of integers, find all the elements that are duplicated. Example: Input: [1, 2, 3, 4,...